GREENS, HERBS AND FOUGERES / aquatic · fresh · metallic
Red Algae
Category
GREENS, HERBS AND FOUGERES
Subcategory
aquatic · fresh · metallic
Origin
Volatility
Heart Note
Botanical
Rhodophyta spp.
Appearance
Colorless to pale green liquid
Odor Strength
Medium
Producing Countries
Atlantic Coast, Brittany (France), Japan, Southeast Asia
Pyramid
Heart
Mineral, iodized, and cleanly saline. Red algae (Rhodophyta) in perfumery is the most restrained expression of marine coastline — less pungent than kelp, more mineral than green seaweed.
Clean and iodine-mineral on first contact — the smell of wet pebbles and sea spray, not of fish market or rotting kelp. Less vegetal than green algae, less pungent than fucus. A saline sharpness that reads as coastal air rather than brine. The dry-down is quietly mineral, like the salt residue left on skin after ocean swimming.
Evolution over time
Immediately
Immediately
Clean iodine and mineral salt — wet pebbles, sea spray, a fresh coastal sharpness
After a few hours
After a few hours
Saline warmth develops, less sharp, more enveloping — driftwood, sun-dried salt
After a few days
After a few days
Quiet mineral trace on skin — like the residue of sea water after it evaporates
The Full Story
Red algae (Rhodophyta) occupies the clean end of the marine spectrum in perfumery. Where brown algae (kelp, fucus) can be pungently iodized and even sulfurous, and green algae reads as vegetal and fresh, red algae offers a cleaner, more mineral expression of coastal saltiness — wet pebbles, sea spray, the iodine sharpness of a tidepool without the rotting-seaweed undertone.
The absolute is obtained by solvent or CO2 extraction of dried Rhodophyta species. CO2 extraction tends to produce a lighter, less sulfurous result. In either case, the material is dark, viscous, and potent — requiring careful dosing to avoid overwhelming a formula with marine-mineral intensity.
Perfumers value red algae for its ability to add authentic coastal character to marine compositions without the synthetic flatness of calone-based accords. It works with ambergris-type molecules (Ambroxan, cetalox) for driftwood effects, with cistus and myrtle for Mediterranean garrigue-meets-sea compositions, and with mineral molecules like Geosmin for a wet-coast-after-rain naturalism.
Red algae get their color from phycoerythrin, a photosynthetic pigment that absorbs blue light and reflects red. Some Rhodophyta species can photosynthesize at depths of over 250 meters — deeper than any other plant-like organism — because phycoerythrin captures the blue wavelengths that penetrate deepest into ocean water.
Extraction & Chemistry
Extraction method: Solvent extraction or CO2 extraction of dried Rhodophyta species. The absolute is typically dark and viscous, with a strong iodine-mineral scent. CO2 extraction yields a lighter, cleaner profile with less of the sulfurous byproducts associated with traditional solvent extraction. Yield data not independently verified.
Molecular Formula
N/A — complex marine organism
CAS Number
N/A — marine organism group, no single CAS
Botanical Name
Rhodophyta spp.
IFRA Status
No known restrictions
Synonyms
Rhodophyta
Physical Properties
Odor Strength
Medium
Appearance
Colorless to pale green liquid
In Perfumery
Red algae absolute functions as a heart-to-base marine note, providing mineral-iodized saltiness without the vegetal heaviness or sulfurous edge of brown algae (kelp, fucus). It anchors aquatic and marine compositions with a cleaner, more wearable coastal character. In combination with calone (CAS 28940-11-6) or melonal, it adds organic depth to synthetic marine accords. Paired with ambergris-type molecules (Ambroxan, ambrein), it creates a convincing driftwood-and-sea-spray effect. Red algae is particularly effective in Mediterranean-inspired compositions where saltiness meets herbal-aromatic notes like myrtle, cistus, or rosemary.
